First off you always need to consult with your physician when it comes to doing any type of activity even if it is meditation. You want to be sure you are safe and healthy enough to practice this particular type of exercise.
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One thing you might consider doing is doing a search online for meditation techniques. The search is going to yield a great deal of information and results, but then you can start to search for cancer patients and see which cancer patients have actually used meditation. You might be surprised by the results because meditation is a wonderful way of healing the body.
It is a good idea to ask your doctor if he or she knows of any type of support group. It would be a wonderful find if you could attend support groups that meditate together. Being able to battle your cancer with a group as opposed to being alone can be a huge spirit lifter.
It is very important that you stay as healthy as possible and you are leading a stress-free life. If you need to meditate a few times a day, then go ahead and enjoy your quiet peaceful time.